1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 14Get this manual
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MERCRUISER 325 erial umber is cated ar ngi wheel hOlli'ing
Figure 6 MerCruiser 325 Serial NoLocation
Figure 7 Inboard Engine Serial NoLocation
lA-4 GE RA IN FO R